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Securities trading and intermediation
 12 Months Ended
Dec. 31, 2025
Summary of Securities, Trading and Intermediation Assets and Liabilities [Abstract]  
Securities trading and intermediation
17 Securities trading and intermediation
Represented by operations at B3 on behalf of and on account of third parties, with liquidation operating cycle between D+1 and D+5.
20252024
Receivables from clearing organizations811,748 1,521,064 
Debtors pending settlement5,568,093 4,985,532 
Other67,026 129,373 
(-) Expected credit losses(147,384)(136,872)
Total Assets6,299,483 6,499,097 
Payables to clearing organizations2,171,301 1,499,960 
Creditors pending settlement5,189,525 3,222,114 
Customer's cash on investment account15,059,980 13,752,904 
Total Liabilities22,420,806 18,474,978